Hi Joan,
Charcoal is a good choice of course, but about pencil (graphite) wrote Bill Creevy in his book:
Quote:
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Not recommended for underdrawings for oils, has a tendency to rise up through the layers of oil paint and in time show through on the surface of the dried (!) painting.
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Although he wrote about fixing with spray, as you suggested. It means that in despite of fixatif, graphite is bad for sketching, isn't?
Cheers.